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Consumer Affairs

Taking the “Zap” Out of Dry Winter Air

Consumer Reports tells you what to look for when shopping for a humidifier


Humidifiers are a hot winter item due to dry indoor air.  During the cold months, sales for humidifiers typically triple due to consumer demand.

The latest issue of Consumer Reports (CR) finds top-rated humidifiers for as little as $30, but shoppers need to be cautious because a few models tested fell short of claims.

"Low prices and a raft of antimicrobial promises can be extremely enticing, but our latest tests show that some models humidify less than their claims suggest," says Bob Markovich, home and yard editor at Consumer Reports. "And even with humidifiers that discourage microbes, consumers will still need to clean and disinfect the tank regularly due to the sitting water."

What you need to know

  • Tabletops cover smaller spaces. The right size is critical because too much humidity can promote dust mites, mold, and other allergens. The Safety 1st, Ultrasonic 360, a CR Best Buy, $30, is designed for 330-square-foot areas. The pricier Air-O-Swiss A0S7135, $170, and Vicks V4500, $65, can cover more space and have a humidistat that automatically shuts them off when they reach a level set.
  • High output means more noise. Console models such as the Essick MA1201, $110, and Kenmore 15412, $140 handle large, open spaces over 2,000 square feet. Both have a humidistat and larger tanks that require less refilling, but are about as noisy as a room air conditioner.
  • Decide on mist. Among recommended models, the Air-O-Swiss A0S7135, $170, and Sunpentown SU-4010, $90, can produce cool or warm mist. The Vicks V745A, $45, uses a heating element to create steam and kill bacteria and other microbes as the water is heated. But steam models can pose scalding risks, so CR recommends keeping them away from children.
  • Don't buy solely by type. Ultrasonic humidifiers are quiet because they trade the usual fan for a vibrating nebulizer, while evaporative models blow air over a wet wick, and impeller models produce mist using a rotating disc. But performance varied widely for all types.
  • Keep it clean. The Sharper Image HD10, $55 features "Clean Mist Technology" that's supposed to "prevent microbial growth on the surface of the water tank." But Consumer Reports tests revealed plenty of bacteria inside. That's why regular maintenance is critical for all humidifiers; that typically includes changing the water daily and disinfecting the tank weekly.

Filter complaints

Danielle of Buchanan, NY, has had a problem with filters. "I had bought the (Evenflo Cool Mist) humidifier and love it. The only problem is the refills," she writes ConsumerAffairs.com. "I can use them two or three times then they need to be thrown away! The color and the smell of them is horrible! It says on the box they have this Microban in the to prevent this but does it work? No." Danielle says it's costing her "a fortune" to replace the filters.

"I purchased the care free humidifier plus from Hunter, thinking that I will never need to replace the filter," writes Ethel from Kearny, NJ.  She says she stored the machine after five months of use and then unpacked it to use when cold weather returned. "When I turned on, the machine started to smell really bad like mildew. I called the company and they told me to purchase a new filter. Then I asked about the 'No need to replace filter' advertisement, she told me she could do nothing about it."

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